Snippet from our Info.plist

Info.plist

        <key>CFBundleDocumentTypes</key>
        <array>
            <dict>
                <key>CFBundleTypeExtensions</key>
                <array>
                    <string>insight</string>
                </array>

                <key>CFBundleTypeName</key>
                <string>Orexplore Insight Hole File</string>

                <key>CFBundleTypeRole</key>
                <string>Viewer</string>

                <key>CFBundleTypeIconFile</key>
                <string>${MACOSX_BUNDLE_ICON_FILE}</string>
            </dict>
            <dict>
                <key>CFBundleTypeExtensions</key>
                <array>
                    <string>insight-project</string>
                </array>

                <key>CFBundleTypeName</key>
                <string>Orexplore Insight Project File</string>

                <key>CFBundleTypeRole</key>
                <string>Viewer</string>

                <key>CFBundleTypeIconFile</key>
                <string>${INSIGHT_MACOSX_PROJECT_ICON_FILE}</string>
            </dict>
        </array>